package demon1;
public class Computer {
    public void powerOn() {
        System.out.println("打开电脑");
    }
    public void powerOff() {
        System.out.println("关闭电脑");
    }
    public void useDevice(USB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse=(Mouse)usb;
            mouse.click();
        }else if(usb instanceof KeyBoard){
            KeyBoard keyBoard=(KeyBoard) usb;
            keyBoard.inPut();
        }
        usb.colseDevice();
    }

    public static void main(String[] args) {
        Computer computer=new Computer();
        computer.powerOn();
        //使用鼠标设备
        computer.useDevice(new Mouse());
        //使用键盘设备
        computer.useDevice(new KeyBoard());

    }
}
